lundius



1,586,564 E. R. LUNDxUs TESTING SYSTEM Filed Dec. 13, 1924 asheets-sheet 1 June 1 1926.

HUD un June 1 1926. 1,586,564

E. R. LUNDlUS TESTING SYSTEM Filed Dec. 13. 1924 8 Sheets-Sheet 2 June 11926. 1,586,564

` f E. R. LUNDIUS V TESTING SYSTEM Filed Dec.l 13 1924 Shee'LS-Shee 3June 1 1926. 1,586,564

E. R. LUNDIUS TESTING S'YSTEM Filed 13, 1924 8 Sheets-Sheet 4 y Aff/yJune 1 19.26.` 1,586,564

E. R. LUNDIUS TESTING SYSTEM Filed Dec. 13, 1924 8 Gets-Sheet 5 June 11926.` 'n 1,586,564

E. R. LUNDHUS TESTING SYSTEM Filed Deo. 13, 1924 8 Sheets-Sheet 6 E. R.LUNDIUS June 1 1926.

TESTING SYSTEM M M H T a N INN NNW H June 1 1926. 1,586,564

E. R. LUNDIUS TESTING SYSTEM Filed Dec. 13 1924 8 Sheets-Sheet 5Patented June 1, 1926.

Unirse STATES tssaaei PATENT OFFICE..

ERIC R. LUNDIUS, OF RICHMOND HILL, NEW YORK, ASSIGNOR TO WESTERNELECTRIC COMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEWYORK.

TESTING SYSTEM.

Application filed December 13, 1924.

This invention relates to telephone eX- changc systems and particularlyto systems employing automatic switches tor extending connections.

In large exchange areas it is customary to employ register senders forcontrolling the operation of selector switches in the extension otconnections. These register senders :include a plurality ot registerswhich are set t'cr an otlice code in accordance with dial interruptionstroni a subscriber-s station. The registers control what is known as atranslator, Vwhich in turn controls a nuinher ot operations greater thanthe nuniher ot digits which it is convenient to employ for an otlicecode. It has heen custoniary to malte these translators an integral partot the rregister senders, but a later practice in dientes that it ismore econoinical to use connnon translators selected by senders as'taken for use.

Heretoiore the testing ot the translators has heen a function ot thetesting ot the sender. It therefore required that either the sender asmaintained out of Service tor a loing tinie in order to malte a completetest of the translator, or the test ot the translator was more or lessperiunctory.

With translators made con'nnon to a plurality ot senders it hecoinespossible to test the translators independent ot the senders.

It is an object ot the invention to proride testing apparatus ttortesting sender selected translators.

A teature ot the invention lies in means 'tor hegil'ining a routine testoit translators with any translator.

Another Ytfeature ot' the invention lies in ineans 'tor setting aregister o'll the test set troni the translator and making the advanceot' the test depend upon the correct setting ot this register.

Other features of' the invention will he aiiparent troni a considerationot the ollowing description in connection with the drawings and appendedclainis.

In the drawings, F ig. l shows a translator and pulse inachine.

Fig. shows the master selectors.

Fig. 3 shows the keys for controlling-the selection of the translators.

Fig. fl shows three sets ot connector Serial No. 755,520.

switches for connecting to a particular translator.

Fig. 5 shows a plurality of registers to be set by the translator.

Fig. G shows a plurality of control keys and relays together with analarm switch.

F ig. shows a control sequence switch and counting relays torpositioning the translator.

Fig. 8 shows the keys which are en'iployed in checking the setting ofthe registers ot Fig. 9 shows the arrangement oit the relnaining ligurestor a complete disclosure ot the invention.

The translator ot Fig. l is the saine as that disclosed in theapplication ot' XV. G. Blauvelt, Serial No. 231,559 .tiled May 20, 1925.The master switches and connector switches olf Figs. 2 and 4t may be oitany well lrnown step-hy-step type.

Betere describing the operation ot the system in detail, a briefdescription oft the method ot operation may he desirable. The testingdevice as shown is equipped to test a inaxiinuin of 400 translators. Theinaster selectors 210, Q20 and 230 serve to connect the test set withthe translator connector switches shown in Fig. it. The lnaster switches2l() and serve to extend circuits troni the translator of Fig. l to theregisters ot' Fig. 5. Switch ..30 controls the advance oi. all threeniaster selectors and exten/s certain of the circuits from thetranslator to the test set. The connector switches are arranged in'pairs7 4100 and 410 comprising one pair, 42() and 4.30 a second pairand est() and '-LLBG a third pair, as shown. in 'the drawings. Switches4:00 and -itlO are con* nected to the No. l ,tern'iinals ot the masterswitches, 420 and 43() to the second terininals, ed() and 450 to thethird terminals. For simplicity only switches irl-t) and 45() are shownwith elahorations ot the wir` ing. The connector switches serve toextend to a` particular translator the circuits troni the testing devicewhich the inaster selecM tors have extended to a particular set ot'connector switches.

The keys of Fig. 3 are lused to direct the master and connector switchesof Fig-s. 5B and it to the desired translator. A circuit is providedover the normal contact of a key ot set 300 and 310 and a correspondingterminal on switch 230 in successive positions ot' the switch t'croperating a relay which controls the advance oi: switches 210, 220 and230 from position to position until the position corresponding to theoperated key is reached, at which time t-he above mentionedcircuito'p'ene'd and the switches como to rest. y

Similarly a path is closed for advancing switch fel-50 over thenormalc'ontact'aot yalkey of set 850 or 360 and terminals of switches'450 and/.1:40 `until the switchis in afposiltion corresponding to theoperated key. This :circuit is ycompleted -only' when both switches arein the same position. yThe Aabove cirfcuit is opened at 'the zoieratedlkey and 'the switch is brought to rest.y At 'eachl step a local circuit.is closed, through arcs of switches 4150 and- 440 fior stepping theswitch 440 to the position corresponding to that of switch'l-50. Inorder to insure that all master and connector switches are connectedwith the same translator the circuit for .initiating tests extendsthrough an arc ot eachfswitch involved. It' this circuit is notcompleted, the time alarm circuit functions to apprise the testeroftrouble.

The keys of Fig. are used infdirec'ting the selected translator` to thedesired yterminal. The translator is operated on the revertive -impulsebasis 'as isset 'forth in the above identitied application ot' W. G.Blau- Velt. A. fundamental circuit of the usual type is employed insetting the switch of Fig. 7 controlling` an arrangement in the test setcorresponding to the sender which normally functions in the setting. ofthe translator. The counting relay circuit closed bythe stepping relay723 extends through the operated key of the key sets in the variouspositions of the test sequence switch. Keys are provided. in Fig. 6 forenabling the -tester to start atest, to vrestore the testing circuit -tonormal, to repeat each particular test, rto control the advanceof thetest circuit when itis blocked because of faulty operation of thetranslator, and for other purposes. l

The registers of Fig. l5 eachy consists of four relays. The leads whichtransmit the pulses for operating these relays are connected directly tothe pulse machine as they do not become effective unless one of thecontrol relays 501, 511, 521, 581 or 541 is operated at the same time.The circuits for operating the above enumerated relays extend throughthe master and lconnector switches tothe translator and are completedonly when the translator has been positioned. Then any one of thelrelays 501, 511,521=531 or 541 is operatedya.circuit is completed overthe armature ont lthe operated relay to a 'relay' of thel correspondingregister. Circuits are completed through the armatures of the registerrelays in accordance with their setting to correspond to the digitswhich a register may be called upon to record.

The keys oi' Fig. S are used to check the setting ot the registers. Aparticular combination ot pulses corresponds to each particular settingof the translator and hence aparticular combination of keys in the setsot Fig. 8 corresponds to a particular combinationof'fkeys in the sets ofFig. 7. The tester is supplied with tables setting forth thesecombinations. yHence whenever the keys of Fig. 7 vare operated thecorrespond- :keys of Fig. 8 are operated. Circuits. are provided throughthe contacts ot the operated keys, through the relays correspoiidin'gtoeach set and through the' contacts or `the register' relayscorresponding thereto, which. are completed provided the register hasbeen set properly. In addition 'aseri'es circuit isprovided through thecontacts of the keyset relays which is only completed if all theregisters are correctly set. rll-his circuit serves vto advance the testset ,to test the next translator unless the repeat key` or other key hasvbeen operated for the purpose of changing the routine.

The time alarm switch 650 is merely a step-by-step switch 'operatedunder the `control ot an interruptor to measure a su'tlicient length ottime to complete the test ot a translator, in addition to the ltimenormally occupied by the translator in use, before operating an alarmsignal.

In making a vroutine test ot all the translators, the No. 1 master key,the No. 1 connector key, the particular circuit key 601 and the startkey 602 would be operated in the above order. Any desired combination ofkeys of sets (50, 760 and 770 and the corresponding combination of keysof Fig. 8 would also be operated. As soon as the first translator hasbeen tested key 601 would be restored and the testing device wouldcontinue to test the translators until stopped by some troublecondition.

A routine test of the translators of an oitice may be started beginningwith any translator. For purposes oi illustration let us assume that thetest is to be started with the l15th translator. This translator will beconnected to the No. 5 terminals of the third pair oi connectorswitches. Hence the No. 3 master key 303, and the No. connector key 355are operated, after which key 601 is operated and finally start key 602.The operation of these keys completes a circuit from battery ythroughthe winding ot :clay (303, normal contactof stepping magnet 231, brush23'? o'l'I master selector 230 and-its normal contact, right closedcontact of key 303, conductor 057, Contact v607 01" key G01,- contactG09 of key '602,1 to ground. rlhe oper- :rra

llO

key 602. Due to the inclusion of relay 60G in this circuit, relay 603 isnot able to operate. Relay 606 operates and connects ground over contact609 of key G02, cont-act 60!" oli` key 001, outer lett back contact ofrelay (505, front contact et relay 000 to conductor (S08 to which theright contacts ot key sets 350 and 360 are connected.

Since key 355 is operated the circuit from ,ground just traced tocoinluctor ($010 is eritended over the right closed contact ot key 355,brush and its No. terminal, normal te ininal of brush 452, back contactand winding ot stepping maonet 451 to battery. Magnet 451 operates andadvances switch 450 to position l. Jits soon as switch 450 reachesposition l a circuit is closed 'from ground, brush and its No. l'terminal, normal terminal ol" 1crush 443, back contact and wlndin'g ofnui-guet 441 to battery. lvlagnet 441 operates and advances switch 440to position 1.

As soon as switch 450 steps to position i, the circuit above traced tormagnet -l5`l is opened However, a circuit. is completed in position ll'from battery, through the winding and back contact oit magnet 451, bush452 and its No. l terminal, conductor 438, leit normal contact ot' key2351, No. l terminal ot brush 442, conductor 439, No. 3 terminal ofbrush 233, inner right back contact oi relay 505, contact ('ll of key(30h Contact 014 of key 602 to ground. lnlagnet 451 operates in thiscircuit to advance switch 450 to position 2. ln position a circuit iscompleted from battery through the winding and back contact ot magnet441, brush 448 and its No. l termina-l, brush 453 and its No. 2 terminalto ground advancin,Ql switch 440 to position 2.

In position 2 of switches 440 and 450, a circuit is coirpleted frombattery, winding and back contact of magnet 451, brush 452 and its llo.2 terminal, conductor 44S, lett normal contact o'l key 352, No. 2terminal and brush 442 and then previously traced to ground atkey G02.Switch 450 is advanced in this circuit to position ,3 in turn advancing'switch 440 to position 5.

In position 3 asimilar circuit to that above traced is completed overthe No. 3 terminals of brushes 452 and 442 and the lett normal contactot key 353 tor advancing switch 450 to position 4 which in turn advancesswitch 440 to position 4. In position 4 a similar circuit is completedover the No. 4 terminals of switches 452 and 442, lett normal contact ofkey 354, and switches 440 and 450 are advanced to position Viithswitches 450 and 440 in position 5, since key has been operated, thecircuit for advancing switch 450 is open at that key and the switch-esare not advanced ont of that position. A circuit is completed frombattery, through the winding and back ,battery through the winding ofrelay 605,

outer right liront contact of relay 615, contact 6l? oit key 602 toground. The operation ot relay 605 closes a plurality ot circuits forreleasing the master and connector key sets 300 and 310, 350 and 350.lThese circuits may be traced from battery through the winding oi'magnet 320, outer left front contact ot relay 605, conductor 657,contact G0? ot key U01, contactI (S00 ot key 602 to` ground; 'frombattery through magnet 321, inner lett front contact ot' relay 005,contact till ot' key ($01, conductor 571, contact 014 ot key 602 toground; from battery through the windings oft magnets 322' and 823 inparallel. inner right contact of relay contact 515 ot' key 601,conductor 671, contact (Sl-l ot key (SO2 to ground. A circuit isthercu'ion closed from battery through the winding and back contact ofmagnet 451, brush x52 and its No. 5 contact, lett normal contact of key355, No. 5 terminal and brush 442, conduct-or 439, terminalv 3 ot brush233, winding oi relay 618, conductor 008, brush 227 and its llo.terminal, brush 217 and its No. 3 terminal conductors 240 and (57i,contact G14 o key 602 to ground. It will be noted that this circuit isonly completed when the master and connector switches have all taken upthe positions indicated by the keys.

lllhen key 002 was lirst operated, a circuit was closed trom battery,through the winding oit elay 61.9, contact 521, oi key C01., upper itcontact oi' cani 716, conductor contact 612 oit key 602 to ground'.Relay 610 operates and locks over its lett Ytroni contact. contacts 620ot k i 002 to ground. y

lll'hen relay (l 5 operates as above described, a circuit is closedtroni. battery through the windingl of relay 023, brush and its normalcoi'rtact, contact ot key (S, conductor (358, outer lett front contactot relay 015, upper "ight cont-act ot cam '716, eoruluctor contact (H2ot key G02 to oind. Relay (23 operates and. locks over inner right frontContact, contact (32T et key G26, inner lett back contact ot relay i' 3to ground. The operation of relay 623 closes a circuit 'from battery,through the winding ot stepping magnet 655, brush 653 and its ott-normalterminals, middle right front contact of relay 623, contact otinterruptor 02S te ground. Magnet 055 operates in this circuit undercontrol ol' interruptor 62S to c "ch 050 from terminal to termithelockinga circ-uit ol'4 relay opened hel'orc switch 0550 reaches ucircuit is then completed tor l alarm apon lamp (350 ni battery throw t,paraftus (no shown), over the Nos, l? and 1.8 terminals ol brush 05*outer right lront contact oi relay (S23-l to ouud. circuit is valsocon'ipleted rom battery through register 020, llo. terminal ot brushGeil, inner l iront contact el" relay 023, contact j' hey 020, innerle'it back contact ot' relay ground lt' the test is completed beore "heswitch arrives in position l?, relay im is operateo` and lthe locking;circuit o'lf' relay 02.4?) o'iened, Releasing that relay and closingl a.selr-interrupting circuit through magnet (S55 and its back contact,brush 651 and its oliVA normal contacts, outer right h; contact relay022.?) to ground for restoring :nritch 0510 to normal. .lu the case et atrouble condition, switch (550 does not alliance beyond position 18 andit is neces- -=iry to operzftte lrey to open the locking `Vfuit oljrelay 023, to restore the switch to Vnormal and retire the lamp 656.

lllhen lreys 001. and l-02 are lirst operated 'i circuit is alsocon'ipleted from battery,

"l.` the ruf;l t winding' ol relay 701;, conhey (01, outer right haeltcon- (Sl, contact l'l' or hey 602 to Y "l" is provided with a loclrwily'J e .nd'uir trom battery through vinding and lett 'iront contact of y,brush 220 and thence through ti se l connector switch to the selectedtrant tor, which circuit is completed when 1u1..ifu'i is cstaluisherlwith a` busy translll later.

desired transhas been found and that the selector 'ting on the terminalsconmslator. Then relay 015 'the energizingl circ-uit ol relay l0/lvneil. li the translator ot Fig. l, which been assruned to have beenselect-ed for is busy, ground will be connected to t( Ininal ot brush 1-5l over contact iut-ty jack 1.02 from the trans 'li0 shown in thedotted rec tlm lett o' l? l, to complete the previously traced throughot' relay T04, holdings,T re- However, ilZ the trausnot busy, groundwill not cel u to the ii'lth terminal of brush will relea soon as Therelease of relay 704 trein battery througl the c y i053, resistance i06,upper cam contacts 101 and 160 lo. terminal of brush 45e, lf of crush220, lett haelt con tact of relay 704 and thence in parallel through theWinding ot relay "T12, and over the lett back Contact ol" relay 705,upper contacts ot cam 700, to resistance 707, contact (STO ot lrey 630,contact (ill ot key 602 to grrjinnd.

ltelay i-.l operates and closes a circuit 'from battery through the1winding,l ot relay 10ft, to ground at the front contact of relay 1.03.ltelay 104 operates and closes a circuit Ylrom battery, through relay1.077 outer right Yfront contact oi? relay lOl, upper lett contact otcani 1.08, No. 5 contact oli" brush 455, conductor el(l\lo. 23 contactot brush 225, resistances 708, 709 and 710, upper contact of cam 711,Winding oli' relay 705, right back contact otl relay e, contact of relay(S18, inner right front contact oi? relay 615, contact 60"? ot key 601,contact 609 ot lrey (502 to ground. Relay 705 operates in thiscircuitand removes the shunt around the Wind-- ing' of relay 712,permitting that relay to eiiergize in the previously traced circuit oitrelay 1.03. The operation ot relay T12 closes a circuit from batterythrough the Winding of relay 713, upper contact ot cam 714e, contact ol"relay F12 to ground. Relay i' 13 operates and loclrs over its innerright iront contact, outer lett back contact ot relay 715, lower contactolf cam '716, conductor #555, contact 012 ot key G02 to ground.

The operation ot relay 713 also closes at its left i'ront contact alocal circuit for relay 17. Relay 717 operates and at its lett lirontcontact furnishes battery for the counting relays. It also closes acircuit from battery, winding or sequence switch magnet 700, lowerContact of cam 718, outer right i'ront contact oil relay 717 to ground.Magnet 700 operates and advances the sequence switch to position 2.

The operations which have just been described constitute three tests,namely, the ability ot relay 103 to operate on a minimum amount ofcurrent, the operation ot' rela)Y 10111 in response to the operation ofrelay 1.023 and the continuity oli the circuit oli relay 10T through.the Contact oit relay lll-l and sequence switch cam 108.

rlhe translator is held busy when the test circuit advances to position2 from ground at Contact 611 ol' key 602, Contact @l0 oi' lrey (S3-30,th rough resistance 70T, Winding' ol relay (152, lett haelt Contact ofrelay .7 0-1i and thence as traced to brush loll and its No. 5 t uinal,Contact 100 ot' jack 102 to cam 151 ot translater linderlll. This.ground holds relay l03 or relay 1.0i energized depending;,upon thepo'`r tion of the translator sequence switch. position 23 ground isextended from Contact 61:2 ol' key 002, over the upper lett contact ot'cam 719 and the above traced circuit, holding the translator busy untilthe test cirn cuit leaves position l5.

lVhen .sequence switch i" 00 reaches l recense@ reached the No. 3counting relay .is operated, 'when the second reached the No. 2, whenthe third the No. 1, und the fourth the No, in the usual manner. lllhenthe No. 0 countingl relay operates the fundamental circuit is opened undrelay T releases in turn opening the circuit olf the npdrive magnet 113stopping the translator switch in po` sition to select the fourth set ofbrushes. The release oit relay 107 also closes e. cir cuit 'from batterytlnough the winding of sequence switch magnet 100, upper right contactof cani 110, lefthacl; Contact et relay 10T to ground advanci"g;V thetranslator seq iilence switch to position il. lilith sequence switch inpcf-ations 3 to a. circuit is completed freni battery through theWinding oit tripping; magnet 115 und right contacts of cuni to ground.

The operation of' the No. 0 coiuuiiuil rclay also coi'iipleles u.circuit from battery, through the windingl of sequence switch magnet700, upper right Contact oil? car 718, front contact of' the No. 0eonntii r relay to ground at key 79.4. rlhe magnet 700 operates andadvances the est sequence switch to position G. 1n passing Alfroin position el to position (i the locking circuit olf the counting' relays isopened and the relays released.

ln position the iifundunienlul circuit is again estahlislied and clays10T und 7f3?) operate. Relay 107 loels in the circuit ireviously tracedto the fundamental circuit, and the holding; circuit is prepared throughthe ri ,eht front contact of relay 10"? lower Contact olf cani 109,louer contact o'l cani 10S, cominutator strip 11T. lirush 'llt toKground. The operation ot relay 10T closes a circuit 'freni hatterythrough tie Winding' of sequence switch magnet 100. lower left contactof cam lll, Ve'it front contact ot relay 10T to grouinl. Sequence switch100 is advanced in this circuit lo position A1-. ln position l a circuitis couiplete/d from luittcry through the Winding of updrive magnet 113,upper coni act ot cani lla-1, left liront contact ot relay 10? lolu'round for advancing); the translator switch in its group.sw-lectingiH increment. Since trippingy meg-net is operated at thistime the :fourth pnir olI hrushes are tripped into operative relationwith the terminals to which they have access.

Alllheu relay 72? operates it closes circuit -from battery. frontcontact oi' relay 71T, Winding el the No. i?, countingv rel i heck'Contact o'l the lilo; /E e(routinev relu/y, conductor 72S, contact orthe No. SZ hey ot' set 700, upper Contact ol' cani Till, contact ofrelay 723, lower contact oi' cani T236 to ground. As the translatorswitch is inoved upward, hrush 118 engages conducting; sep;-v inents ofeoinmntator strip 11i" and stepping relay 723 is shunted 4in the usual-inanneixf lllhen relay 723 has heen shunted three tnies the No. Ocounting relay is operated opening the finulainentul circuit releasingrelays 10il and (23. The release ot' relay 107 opens the circuit of theupdriye .inegnet und stops the translator switch in position to selectsets oli te 'ininals in the 'third group. Relay 10T closes at its hachcon tact a circuit from battery, Winding olf sequence switch magnet 100,upper right Contact ot cani 110, heck contact or relay 107 to groundadvancing sequence switch 10 to position 5.

rllhe ifo. 0" counting); relay also closes a circuit from halter-ythrough the Winding sequence switch magnet 700, upper right contact of'cuni T18, Jfront Contact ol? the No, 0 counting relay, Contact oi liey il to ground, advancing seiipicnee switch T 00 to position 8.

liVit-h sequence switch 100 in position 5 and T00 in posi ion S thefundamental circuit is again established and relays 107 and T2?)operate. Relay 107 operated closes z` lockingl circuit over its ri ght.'liront contact and lower Contact of cani 109 to the fundamental ircuitas her'ore and prepares the holding circuiii at its front contact undthe upper right Contact o1. cani 109, conunutator strip 111. und brush112 to ground. llhe operation oli relay 107 at this time closes acircuit troni liattery through the uiinli-ng` ot loir speed updrive.magnet 110, lower Contact ol` mini, 1141, lelt iront contact or. relay10T to ground. Under the control or the louv speed u'iuggnet 11i) thetranslator brush shatt is advanced in its terniinal selecting movement.

liuo to the operation olf relay TQ3 a circuit is cl sed troni batteryover the lett *liront contact of relay T7, through the Windingl or theNo. 5 counting relay, back Contact oli the No. 5 counting,l relay,coiniluctor 72S). cou-- tact olf the No. 5 hey ol" set T10, upper riContact ot cani 726, contact o'l relay louer right contact et cuni T27,to ground. Allluch time that brush 11i/2 engages a conducting segment ofcomniutatoij strip l1 l the stepping` relay i123 shunted und a pair oi?counting releys operated. lrlhen relay i2-3 hns heen shunted six timesthe No.. 0" count ing relay is operated opoi'iinpv the funda.- n'ienlalcircuit und closing1 a. circuit 'l'roni battery, through. the whirling`og' :nu 1 jnet r(00, upper right contact oil? caro. Till, front Contactof the 0 counting reloy to ground at hey 724. Sequence switch T00 isadvanced in this circuit to position 10. lu moving lfroin position. 5 toposition 10 sequenee switch 700 opens the locking circuit of thecounting relays und these relays release.

The opening o the fundamental circuit also causes the release olf relay10T which opens the circuit of the in .idrive magnet bringing thetranslatorbrush sets te rest.

on the sixth. set of terminals in the selected group. The release otrelay 107 also closes a circuit from batter T Winding of sequence switchmagnet J upper right contact of cam 110, back contact otl relay 107 toground, advancing sequence s `Vitch 100 to position 7.

Then sequence switch 100 reaches position 7 relay 107 is operated in acircuit extending i'rom battery, through the Winding of the relay, uppercontacts of cam 116 to ground. Relay 107 operates and locks in a circuitextending from battery through its Winding, right front Contact, upperlett Contact ot cam 109, inner right front contact of relay 104 toground. The operation of relay 107 closes a circuit from battery,Winding ot sequence switch magnet 100, lower left contact ot cam 110,lett front contact. ot' relay 107 to ground, advancing sequence switch100 to position 3. lVhen sequence switch 100 arrives in position 3 theleads "rom the pulse machine drum are extended through the translatorbrushes to the test circuit.

lVith sequence switch 700 in positions 9 and 10 a circuit is completedtrom battery, through. the Winding of relay 201, upper lett contact ofcam 7 37, conductor 453, contact 612 of key 602 to ground. Relay 201operates and extends the circuits from the pulse machine to theregisters et Fig. 5.

As is set forth in detail in U. S. Patent No. 1,395,977 to F. A. Stearnand F. J.. Scudder, the pulse machine 120 consists ot a cylinder ofinsulated material in which are embedded rings ot conducting segments invarious combinations The brushes which Wipe over these conductingsegments are cross connected to the terminals to which the translatorshave access in such a manner as to cause the proper registration to takeplace to select an outgoing trunk to the otice indicated by the oiticecode. Assuming that the translator has been set on the terminals whichhave been shown in full, certain circuits will be completed as describedin detail later.

Brush 121 Wipes over a row of segments equal in number to the maximumwhich are distributed around the circumference of the cylinder andslightly otl'set troni the rows ot terminals used in setting theregisters. A circuit is completed through this strip of terminalsextending from battery, over brush 122, conducting strip 123, through acontact ot' row 125, brush 121, contact of cam 124, No. 5 terminal ofbrush 457, conductor 461,-No. 3 terminal of brush 216, conductor 241,contacts of cam 702, resistance 730, Winding of stepping relay 723, backcontact of the No. 0 counting' relay to ground at key 724. lVhen brush121 first encounters a. conducting segment of lrow 125 and the abovecircuit lis completed, relay 723 operates and closes a circuit frombattery through: the left fro-nt .Contact olf.-

relay 717, winding ot the No. 6 counting relay, back contact of the No.6 counting relay, conductor 731, lower lett Contact of cam 727, frontcontact oit relay 723, lower l'ight contact of cam 726 to ground. Sincethere are six conducting segments in rou 125 and it takes 7deenergizations of relay 723 to bringI about the operation oit the 0counting relay, the pulse machine will be connected Wit-h the registersof Fig. 5 during at least one complete revolution ofthe drum 120.Assuming for convenience that at the time the circuits trom the pulseniachine to the registers ot' Fig. 5 are completed, the brushes are inthe position shown in the figure, the following circuits Will becompleted when the brushes encounter the iirst Vertical row etconducting segments, from battery, brush 122, ring 123, segrn'ient 126,brush 127, conductor 154, to the inner right armatures of relays 501,511, 521, 531 and 541; battery, brush 122, ring 123, segment 128, brush12), translator brush 130, contact et cam 131, No. 5 terminal ot brush446, conductor 462, N o. 3 terminal of brush 214, inner contact of relay201, Winding of relay 554 to ground; battery, brush 122, ring 123,segment 132, brush 133, translator brush 142, contact of cam 143, No. 5terminal of brush 445, conductor 463, No. 3 terminal of brush 215, nextto the innermost contact of relay 201, Winding of relay 553, to ground;battery, brush 122, ring 123, segment 132, brush 133, translator brush134, contact ot cam 135, No. 5 terminal of brush 456, No. 3 terminal or'brush 224, middle contact ot relay 201, Winding of relay 552, to ground;battery, brush 122, ring 123, 'segmentl 1.32, brush 133, translatorbrush 136, Contact of cam 137, No. 5 terminal of brush 444, No. 3terminal of brush 213, outermost contact of rela-y 201, Winding of relay550 to ground. Relays 550, 552, 553 rnd operate. Relay 550 closes acircuit from battery over its front Contact, Winding of relay 501 toground. Relay 552 closes a. circuit over its front contact through theWinding of relay 521 to ground. Relay 553 closes a circuit over itsfront contactthrough the Winding of relay 531 and relay 554 closes acircuit for operating relay 541. Due to the operation of relays 501,521, 531 and 541 the circuit from battery which was traced as far as theinner right armatures of these relays is extended thereover to the lettWinding oi relay 504, right Winding ot relay 524, right Winding of relay534, right Winding olf relay 544 to ground.

Relays 504, 524, 534 and 544 operate and lock to ground over the lowerleft contact or" cam 732, conductor 458 and contact 612 of key 602. Whenthe brushes of the pulsing machine disengage the iirs't row ofterminals, relays 550, 552, 553 and 554 release in turirreleasing'relays 510.1', 521, 531 and messes 54:1. lllhen the brushes engage thesecond. vertical row ot segments the following oircnits are eonipleted:hattery brush 122, ringl 1:23, segment 133, brush 139, conductor 155, tothe inner lett armatures oi relays ii. ""1, and :3f-t1; hattery brushring' 25 nient 140, hrush 120, translator hrush 130, contact ot cani131, No. contact ot brush 1140, conductor fri-32,1%. 3 contact oit brush214i, innermost contact oit relay 201, Winding of relay 554; to ground;battery, brush 122, ring 123, segment 141, brush 133, translator brush142, Contact ot oain 113, No. 5 terminal of brush 4.45, oonductor 403,No. 3 terminal of brush 215, nett to the innermost contact of relay 201,winding ot relay 553 to `ground; from ln'ush 133 to translator brush136, Contact C .1"0 'W r hf 1 .1...1 ,1,y

oi (am tot, ii o. .i terminal and oiusn fell, No. 3 terminal ot brush213, outermost contact of relay 201, Winding ot relay 550 to ground; andfrom brush 133 to translator brush 134, Contact of Cain 135, No. 5terminal ol? hrush 4156, No. 3 terminal of brush 224i, iniddle Contactot relay 201, Winding ot A, 552 to around. Relays 550, 552, auf. eLoperate in turn causing the operation et the correspending,` relays 501,521,

and 511. The operation of these latter relays extends the circuitcompleted irozn segment 133 to their inner left arina tures to the lettWinding oi relay 503, right iif'inding ot relay 523, right Winding ofrelay right Winding` of relay 543, to ground. Relays 503, 523, 533 and54:3 operate and loelr'to ground at Contact 612 of he 602.

."il'hout tracing; the circuits in det-ail itn'ili he readily seen thatWnen the pulse machine lie-'i ,eje the third Vertical hat ny isconnected over d brush 115 to the outer 'lees of relays 501, 511, 521,531 operated from se t;- in. turn operating relay 511 to ont theoifieration oi relay 515. e ttoiirth `vertical row of terminals edbattery is extended over see:-

S and hfush 1417 to the outer lett .clays 501, 511, 521, 531 and f isoperated so that register operated and locked. lVhen th rows otterminals enis completed to the arma- 511, 521, and 531 and may heconneeted #er sfffi'iieuts to the translator relay `is operated due tovo rows oit terminals.

i a of counting d locked. 1When the n engaged i the No. 0 counting relayis and. "when, d y ngaged. the tio. 0

connt-inp` relay is operated. The operation ot the No. 0 counting` relayopens the circuitot' relay 723 auch closes a circuit :troni battery,through the Winding ot sequence :"h magnet IT00, upper right contact otcani T13, 'front Contact ot the No. 0 counting relay to ground at keyT241, to advance sequence switch 700 to position 12. Thenl sequenceswitch 700 leaves position 10 the circuit ot relay 201 is opened andthat relay releases, disconnecting;- the registers troni the pulsemachine.

The tester in furnished `With a table which. shows the keys of Fig. 3corresponding to a particular settingl of the translator. When thelieys` No. 3 of set 750, No. 2 oi' set 760 and No. ot' set 770, areoperated the Corresponding keys olf the set ot Fig. 3, that is liey otset 310, 321 otr set 320, key 331 ot set 330, key 311 of set 310 and key351 of set 350 are likewise operated. is soon as 'the relays oitregister 500 have heen operated a circuit is completed -tor movingsequence switch 300 into a position corresponding to the classlindicated on register 500.

Assuming that sequence switch 300 is standing` in position 3 from aprevious test, due to 'the operation of the relays ot register 500, acircuit Will be completed troni battery, through the windingr olniagjuet 300. lower left Contact oit cani 301, hack contact ot relay502, conductor 51.0 upper lett Contact ot cani T32. Conductor 53, toground at contact 612 ot key 002, advancing switch 300 to position fl.ln position 4t a eircnit is completed over the upper right Contact otcani 302, hack Contact ot relay 505 to the saine ground. Sequence switch300 is driven ont ot position 5 in the circuit tor drivingr it out otposition 3. lt driven out ot position 0 by a circuit over the upper lettContact ot cani 301, front Contact ot relay 503, to the saine ground.The tiro paths for driving' sequence s fiteh 300 out ont position 7which extend from the lett contacts of cani 302, are both open, one atthe haelt contact of relay 00st and the other at the front Contact otrelay 505 so that sequence switch 300 con'ies to rest in position 7.

Assuming that the translator has oper ated perfectly a circuit iscompleted 'troni battery, through the Winding of relay 311, Contact ofkey 312, lower lett Contact ot cani 303, upper right contact ot Cain732, condnetoiy 4:53, to ground at Contact 612 of key 602. Relay 311operates and closes a circuit from battery over its right troutcontact-through larnp 313, resistance 31e to ground indicatingr that theclass register relays have heen correctly operated.

A circuit is likewise completed troni battery, left liront Contact ofrelay 515, right Contact ot hey 321 winding of relay 822.,-

lett Contact ot key S21, outer lett liront contact of relay 51.2, rightback contact of relay to ground. Relay operates and closes a circuitfrom battery over its front contact, through lanip 823, resistance 824i,to gro-und indicating 'that the district brush register was correctlyset.

A circuit is also completed from battery, right Contact ot key 831,Winding ot' relay 837), left Contact ot key S31, outer left frontcontact of relay 523, right back contact of relay 522-, right frontContact of relay to ground. Relay S32 V,operates and vcloses a circuitfrom battery over its Contact, through lanip 8.53, resistance 831i, toground indicating that the district group register has been correctlyoperated.

In addition, a circuit is completed troni lattery, right Contact ot key8&1, Winding ot' relay 8&2, left Contact of key Sil, outer lei't frontContact of relay 583, right back contact ot rel/ay right iront Contactot relay 534ito ground. Relay operates and closes a circuit from batteryover its Contact, through lamp 84,3, resistance Seel to groundindicating that the otlice brush register has been correctly set.

Another circuit is also yclosed from buttery, right Contact ot key 851,Winding of relay 352, lett contact ot key 851, outer lett iront Contact01"' relay l, right back Contact ot' relay 5&2, right front contactrelay ,5a-il lo ground. Relay 852 closes a circuit 'from battery, overits front contact, lamp S523, resistance 851i to ground indicatingthatthe ollicc group register has been correctly set.

il? all the registers are operated to correspond to the setting; ot thekeys ot Fig. o. a circuit is completed from ground at thel left armatureot relay 811, over its lett :front Contact` lett front contact oit relayS22, lclt trout Contact ot' relay 832,1.ei't trontcontact ot relay l-l,left front contact ot relay H573. winding; ol relay 703 to battery..Relay 703 operates and locks through its inner right contact, upperright contact ot cani 733, Conductor L58 to ground at contact 619 ot key602.

'lhe operation of relay 703 closes a circuit from battery through theWinding oli relay 7l5, outer lett 'front Contact ot relay S-:to groundcausing that relay to operate. Relay 715 closes' an obvious'circuit torrclay T3-l which. in turn closes a circuit troni battery, over its innerlett front contact, through lamp 735, resistance 801i to ground. Theoperation of relay 7.03 also opens the locking circuit ot' relay 623,permitting that relay to release. The release of relay 623 closes aself-interrupting circuit from battery through the Winding and backContact ot' stepping magnet 655 vof the time alarm s mfitchfhrush' 551und its strapped oli-normal terminals, outer right back Contact oi relay023 to ground, restoring the time alarm switch to normal. The operationof relay 715 opens the locking circuit of relay 713 which in turnreleases relay 717 and remoyes battery from the windings of the countingrelays.

)it a. routine test is to be made beginning with vthe tith'translator,as soon as the Gli lamp 735 lights the tester releases key yG01. lVithkey (.501 restored, the operation of relay 715 closes a circuit frombattery through the Winding ol' sequence switch magnet 700, right frontContactV of relay 715, contact 6&9 ot key 646, contact of cam 738,contact 602 o key 6.01, lupper leij't conta-ct of Cain 70l, conductor5.8, to groimdat Contact 612 ot key 602, Sequence switch 7,00 moves outposition l2 and continues to position 1,8, under the control ofits'master cam. The restoration ot key `601 lalso Opens the locking-,circuit ot' relay A(515, in Iturn releasing relay 605; i

il/hen sequence switch 700 leaves position 15, theholdin'g'circuit ofrelay 10st is opened at camA 719 and Arelai;y 1.0.4 releases. yTherelease of relay 104; opens the locking circuit or' relay 107, whichrelay closes at back Contact a circuit from battery, through the windingof sequence switch magnet 100, upper` right contact of cam .110, lettback contact otl relay 107 to ground. Magnet 100 operates and advancesthe translator seque-nce switch to position 9. ln position '9. thccircuit ot down drive magnet- 151 is coinpleed troni battery, vWindii'igotmagnet 151, upper contacts o'lcam 152, left .back Contact ot relay 107to ground.` The translator switch is restored to normal under thecontrol ot magnet 151. `Wlxen the switch reaches norma-l a circuit iscompleted from battery, through the Winding of sequence switch magnet100, lower right contact oi cam 110, commutator segment 153, brush 11Sto ground, advancing the sequence switch to position l0 which is asecond normal position. rihe translator is now available tor use inregular service.

As switch 700 passes through positions 13 to .l0 a circuit is completed'from battery, winding` ot' stepping; magnet 451, No. 3 contact ot'brush234C, contact 631 ot' key 626, contact 632 ot key 601, contact 635 ofkey 685, outer right front contactof relay 703, upper lett Contact ofcani 733, conductor 4158, to ground at vContact G12 of key 602. Magnet#ll operates and steps switch 450 to its Anext terminal. 'Wit-h switch450 in .it-ion 6 a circuit is completed from hat4 ky, through the.Winding and back Contact ot' magnet 441, No. 5 terminal and brush i4-3.No. t3 terminal and brush 453 to ground adrancin switch Li420 toposition 6.

L lV-lien sequence siyitch 700 leaves position 17 relay 703 releases, inturn releasing re-vlays 715 and 734. ldlhen relay 715 closes its hackcontact a circuit is completed from battery, winding.' of magnet 700,right bach; Contact ot relay 715, inner right haelt con tact et relay71.7, upper right contact ot :nui 737, conductor 458 to ground atcontact Gli), oit key G02. ltieqnence switch 700 is adyanced to positionl .in this circuit. lilith relays 7l?) and 717 released and switch 700in position Il the circuit previously traced for relay 7 O41 to test tora busy eondition ot the translator is prepared as previously describedand the tests are now repeated on the next translator.

lt another particular translator is to be tested7 when the OK lamp 735lights, key 602 is restored and key (lOl lett operated. The restorationotl hey 602 closes contact ($38 ot' that key and connects ground throughthe upper lett Contact ot cani 71S to the winding ot sequence switchmagnet 700, driving the sequence switch to position 18. lt also opensthe locking circuit of relay 703 permitting relays 715 and 734C torelease. Vhen sequence switch 700 leaves position 17 the locking circuitof relay 615 is opened and that relay releases in turn releasing relayG05.

The proper inaster key ot set 300 or 3l() and the proper connector leyin set 85() or Sftll are now operated. atter which start key (302 isreoperated. lt the nent translator to life tested is connected to thesaine connector switches as that last tested, the operation ot themaster key will open the circuit'v ot relay G?) and prevent the advanceoi the master switch. The reoperation et key ($02 closes :L circuit'troni battery, through the winding and haelt contact ot stepping magnetei-l. brush and its No. terminal. conductor 4149. lett normal contactot' ltey 8551 No. terminal ot brush e242. conductor 43S), lio. 2%t-erininal of brush 233, inner right haelt contact ot relay ($05,Contact (lliot hey (Stil, emitact ($14 ot key Gilt? to ground.lrlafcjnet /l-il operates and steps the switch to its next position. It,ior example` key 365 has been operated. successive similar paths will beclosed until the switch reaches the position eorresiionding' to hey 2565`Whereupon no path will be available and the switch coince lo rest inthat position. Switch. all() will be ad vauced to the corresifiondingrposition in the manner previously described. i ln the meantime, therestoration and re-opera tion ot it i 602 closes the preu riously tracedcircuit ior adiancing' sequence switch 700 from position 18 to positionl and the circuit for testing the translator .tof a .busy condition isagain preivnared.

It the particular translator to be tested is von a ditlerent connectorswitch from the one last tested, the reoperation ot key 602 will close acircuit frein battery through the windingr ot relay 603. hack contactoi" magnet 231, brush 237 and its No. 3 terminal'. left normal Contactot key 303, outer right baelt Contact ofV relay 05, Contact tfl'i' otley 601, contact G09 el leey no2 to ground.

Relay (303 operating, thc eircu 's through relays and tor advancingmaster switcl es 2l() and il to their next terminals. illastcr switch5.23!) is then adifauced to its No. -l iern'iinal in the inrinnerln'eviously described.

'.ifhe circuit oi relay (i033 is o 'l'icncd when nntrnet Q33 operates,but a new circuit is closed through the succeeding terminals ot brushQ37 until the position is reached corresponding to the master keyoperated. The subsequent operation is the saine as 'nat previouslydescribed tor adir'ancingl a connector to the desired translator.

the next translator to be tested appears earlier in the arrangenienn itis necessary to return the testing` apparatus to norinal betereselecting the translator. To accoinplish this, the returnto-norinal key63) is operated. rllhe operation ot this hey closes a circuit tronibattery through. the winding oit stepping magnet 4:51 and its baci;contact7 brush and its No. 5 terminal, conductor eilt), lett norinalContact ot key 355. lilo. terininal ot brush 442, lilo. f3 terminal o'fl'nush 283, contact Gil() ot liey G39, Contact dill otlievtlOQl'ogrronnd. LSince allot the helfe et sets Sell and 35() are .normalat this time. when switch elfi() reaches its llo. terminal and switchiff-O is advancedto ts No, (l terminal .in the manner previously (le--scribed, a new circuit is conipletcd or r the No. b terminals ot brushes455i and el' and the left norniel contact oit' the No. (l liey ot set35() to advance switch 450 to position 7 and so on until switches 4150and. lei-(l reach position 2l.

lVhen switchA @l0 reaches position :El a circuit is completed iroinbattery. through the winding oit' relay 603, back contact ot niargnet 3"r een u... brush 9,237 and its No. o tact, No. 2l terniinal of brush414-57 to ground. l-lelay GOP operates and causes the adrance oit masterswitches 10. 220. 230 to the No. 4f terminals in the nianner previouslydescribed. lilith switch 230 on its do. #t ternir nal a circuit isconilvileted troni battery, ninding and bach Contact ot magnet /l-Dl.brush 4152 and its No. 2l terminal, No. i terminal oit brush 223 toground. Switch 450 is advanced to normal and in turn advances switch 440to norinal. Key Gill new restored.y and a circuit completed tronibattery. winding oit relay 503, back contact. or magnet 231, conductor536. contact 661 ot liey 639, Atiret set of oil' normal contacts oi'brush Q36. Contact (3482 ol key 639. contact (54.3 ot key G01, contact614; or" key 602 to ground. The operation ot relay 6027 can is theadvance ot switches 210. i220 and 2o@ to the next setot terminals Wherethe eircuit is again established until the switch i230 leaves the firstgroup or translators.,

il O

l"hen brush 230 encounters the terminal ourresponding to the secondgroup ot translators, the circuit is extended Jtrom the winding oitrelay 603, hack contact ot magnet 231, the strapped terminals ot thesecond group and hrusl. 230, contact 042 ot key 639, contact (343 ot key(501, Contact 014 ot key (1302 to ground. The above circuit serres toadvance the master switches to their No. 21 terminals. YVhe-n a key otset 300 or 310 is operated to select the next translator' for test acircuit is completed from battery through relay 603, hack contact otmagnet 231, brush 237 and its No. 21 terminal, contact ol the operatedkey, contact 607 ot key 001, Contact 009 ot key 602 to ground. rThiscircuit advances the master switches to normal. The advance to normalafter a routine test is acconfxplished through a circuit (not shown)including the No. 21 terminal 4ot hrush 230 and the No. terminal. ot theluf-ftconnector switch.

.ln case the translator tails to operate correctly at any point the testcircuit will not advance to the next posit-ion. rl`his advance is inmostcases under the control ot the counting relays. lf the circuit doesnot advance properly, the time alarm switch 650 is permitted to reachits No. 17 terminal and to light the lamp G56 and sound an alarm t notshown). lVhen the alarm signal is observed, key 623 is operated, openingthe locking circuit ot relay 523, retiring the signal and permitting`the restoration ot the time alarm switch to normal. The tester theneither makes a note. olf the trouble encountered or corrects it, itpossible. Inserting a. plug in make-busy jack 102 removes the taultytranslator from service, and holds it husy to linder 15.0 after switch450 has advanced to another translator.

rlhe test is permitted to proceed hy the operation ot key 646. Theoperation ot this key closes a circuit from battery, through the windingot relay 703, Contact 647 ot key (46, lower lett contact ot cam 733,conductor 458, to ground at contact 612 of key G02. Relay 703 operatesand locks over its inner right contact, upper right Contact ot cam 733,conductor 458 to ground at contact (312 ot key 602. The operation votrelay 703 closes a circuit tor operating relay 715 which in turn causesthe operation ot relay 734. llilith relay 715 operated a circuit isclosed, provided sequence switch 700 is in positions 2 to 10, frombattery, through the winding ot sequence switch magnet 700, right t'rontcontact et relay 715, contact 643 ot key 646, lower lett contact of cam737 to ground at contact 612 of key 6 02. Sequence switch 700 adrancesin this circuit to position 12. A

lt it is ,decided to reserve repairs until later, key 345 is nowrestored completing a circuit new battery, thro-usb the siedi-,lis

rasees@ ot magnet 700, right front contact ot relay 715 contact 649 otkey 646, contact oit cam 733, contact 6.62 et key 601, upper lettcontact ot cam 701, lconrhictor 458 to ground at Contact 612 ot key 602.Sequence switch 7 00 is brought to position 18 in this circuit and inmovingT from position 12 to position 13 advances the connector switch tothe next translator in the manner previously described. rhe sequenceswitch is then restored to position 1.

It' the trouble is such that it can he corrected at once, it isdesirable to retest the translator to make sure that the repair has heensuccessful. To do this, repeat key 63o is operated betore key 646 isrestored. The operation ot key (S36 opens the circuit tor advancingswitch 450 to the nent translator and hence the tests are repeated onthe same translator. As long as key 636 remains operated the testcircuit will continue testing the same 'translator unless trouble isencountered. The operation ot key 633 also transfers the meteringcircuit from meter 663 to meter 664 so that the repeat tests arerecorded on the latter meter.

lt is sometimes desirable to make the translator tests from a positionwhere the operation of the translator itselt may he observed. ln orc erto do so, keys 636 and 724 are operated. The operation oll ,key 630connects ground, from contact G41 ot key 00,2, contact 665 ot key 639,over Contact ot key 635 to the sleeve of jack 740. The operation of key724 removes ground from the armature ot' the No. 0 counting relay andplaces the connection ot ground thereto under the cont-rol ot relay 739.The keys 741 and 742 are located in a portable hon and are connected hya cord and plug 743 to jack 740 which is located at the translator testset trame. With the test set directed to a particulartranslator, key 742is operated, closing a circuit trom battery, front Contact yof relay717, which was operated when the set connected with the translator,winding of relay 744, right back contact ot relay 739, ring oit jack740, ring` ot plug 743, contact ot key 742, sleeve ot plug 743, sleeveot' jack 740 to ground. Relay 744 operates and closes a locking circuitfor itselt` from battery, through its winding, winding of relay 739,front contact ot relay 744, upper right contact ot cam 719, to ground atcontact 612 ot key G02.

lWhen key 742 is released relay 739 operates in this locking circuit andconnects ground to the armature ot the No. 0 counting relay. connectground tothe armature or" the No. 0 counting relay lcomiileted thefundamental circuit through the winding oit relay 723 and permits brushselection yto take place. When the No. 0 counting relay operates andswitch 7 0,0 moves out of posi- The operation ot relay 739 to

